unsure

Synonyms: betwixt and between borderline distrustful dubious fluctuant fly-by-night hesitant iffy in a quandary indecisive indeterminate irresolute lacking mistrustful open problematic rootless shaky skeptical suspicious touch and go unassured uncertain unclear unconfident unconvinced undecided undependable unreliable unstable untrustworthy untrusty up for grabs vacillating wavering weak wimpy wobbly

Antonyms: certain definite secure sure undoubted